• Competing at European Under-21 Championship not certain• Manchester United manager will keep monitoring Jones's kneeSir Alex Ferguson has stated that Phil Jones's participation in the England Under-21 team at this summer's European Championship is not guaranteed as Manchester United continue to monitor his return from injury.Earlier this week Roy Hodgson, the England manager, said Jones should be part of a strong squad for Stuart Pearce, the Under-21s' head coach. Ferguson, however, did not sound so sure. "We'll have to wait and see how things are," he said. "The boy's had an injury this season, which has needed looking after. We'll see what it's like in the summer."Jones missed the start of the season because of a back problem before suffering a more serious knee injury that meant he did not play his first game of the campaign until 20...